On the weekends, I just walk/run around my neighborhood. Because I live in a fairly small neighborhood, that basically means I'm circling the block 3-4 times. It does give me some elevation work, but there aren't any bad hills. It's pretty gentle.
Today's workout:
(1W/30 sec R)x20, 5W
weather: sunny. not to hot, yet
distance: ~2.8 miles